CI: Telemetry for step trace is broken

[joestringer]

PR #32037 introduced telemetry to several workflows.

We can see in the original PR that the "Step trace" breaks down the time contribution from various different steps throughout the job (triggered from PR):

https://github.com/cilium/cilium/actions/runs/8731358629

More recently the step trace reports that all of the steps happen at the same time for the same length (Ariane-triggered, from PR #32167):

https://github.com/cilium/cilium/actions/runs/8880222005

We should investigate and resolve the issue that is causing the step trace to incorrectly report step timestamps and duration.

[joestringer]

Related, this workflow run complains about misformatted gantt chart in the step trace. This is PR #32020 and a different workflow (ci-ipsec-upgrade).

https://github.com/cilium/cilium/actions/runs/8817802264

Unable to render rich display

Parse error on line 11:
...1713967134000 Call actions/checkout aga...
----------------------^
Expecting 'EOF', 'SPACE', 'NL', 'weekday_monday', 'weekday_tuesday', 'weekday_wednesday', 'weekday_thursday', 'weekday_friday', 'weekday_saturday', 'weekday_sunday', 'dateFormat', 'inclusiveEndDates', 'topAxis', 'axisFormat', 'tickInterval', 'excludes', 'includes', 'todayMarker', 'title', 'acc_title', 'acc_descr', 'acc_descr_multiline_value', 'section', 'taskTxt', 'click', got 'callbackname'

For more information, see https://docs.github.com/get-started/writing-on-github/working-with-advanced-formatting/creating-diagrams#creating-mermaid-diagrams

It's possible that the root cause of the misreported step trace data is that the plugin is failing to properly format the gantt chart for GitHub to then interpret and draw the results.